The graphic on the top shows how a high-angle normal fault cuts between two of the earth's plates. The block on the right shifts down as the fault moves. The graphic on the bottom shows a low-angle ...

Over the last several weeks, earthquakes have rocked parts of the United States from Alaska to Wednesday morning's quake in Tennessee. The most recent quake registered as a magnitude 4.4, just ...

While it is often said that mountains don’t move, in reality, the Colorado Rocky Mountains are the result of a slow dance that has been occurring beneath the earth’s surface for hundreds of millions ...